Azeotropic composition containing 1,1,1,3,3,3-hexafluoro-2-methoxypropane

ABSTRACT

An azeotropic composition a formulated with 1,1,1,3,3,3,-hexafluoro-2-methoxypropane and a second component selected from the group consisting of isopropyl alcohol, ethanol, methanol, and trans-1,2-dichloroethylene. The azeotropic composition exhibits a substantially constant boiling point at a constant pressure and is useful for various cleaning and degreasing applications.

CROSS-REFERENCE TO RELATED APPLICATION DATA

This application claims the benefit of and priority to Provisional USPatent Application Ser. No. 62/699,415, filed Jul. 17, 2018, titledAZEOTROPIC COMPOSITION CONTAINING1,1,1,3,3,3-HEXAFLUORO-2-METHOXYPROPANE, the disclosure of which isincorporated herein in its entirety.

BACKGROUND

The present disclosure relates to azeotropes, and more particularly toazeotropic compositions containing1,1,1,3,3,3-hexafluoro-2-methoxypropane.

An azeotropic composition is a mixture of at least two differentmaterials, which behaves like a single substance having a constantboiling point. Azeotropic compositions or compositions having anazeotrope-like characteristic of a constant or nearly constant boilingpoint have been found very useful in many industrial applications. Forexample, azeotropic compositions have been utilized as cleaning agentsfor removing flux residues on electronic circuit boards after solderingand cleaning or degreasing agents in automated cleaning operations. Insuch operations, an azeotropic composition may be used to remove greaseand other contaminants from target articles, wherein post treatmentprocesses of the used composition may involve evaporation andcondensation to recycle the composition. The azeotropic compositionsbehave like a single substance and evaporate at a constant boilingtemperature, such that vapor produced from evaporation or distillationprocesses has substantially the same composition as the initialazeotropic composition. This may simplify the post treatment processesby eliminating the step of measuring the proportion of components in therecovered composition, and supply make-up components in a proportionnecessary to re-establish the original composition.

However, as well known in the art, formation of azeotropic compositionscannot be predicted, thus presenting challenges in research anddevelopment of new azeotropic compositions. As such, there remains aneed to develop new azeotropic compositions having desirable properties,for example, solvency and cleaning properties.

BRIEF SUMMARY

Azeotropic compositions containing1,1,1,3,3,3,-hexafluoro-2-methoxypropane (“HFMOP”) useful for variouscleaning applications are provided according to various embodiments.

In one aspect, azeotropic composition may be formulated with about 52weight % (wt. %) to about 99 wt. % HFMOP and about 1 wt. % to about 48wt. % of a second component selected from isopropyl alcohol (“IPA”),ethanol, methanol, and trans-1,2-dichloroethylene (“trans-1,2-DCE”.)

In an embodiment, an azeotropic composition may be a mixture of about 94wt. % to about 99 wt. % HFMOP and about 1 wt. % to about 6 wt. % IPA. Inanother embodiment, an azeotropic composition may a mixture of about 94wt. % to about 99 wt % HFMOP and about 1 wt. % to about 6 wt. % ethanol.In another embodiment, an azeotropic composition may be a mixture ofabout 91 wt. % to about 97 wt % HFMOP and about 3 wt. % to about 9 wt. %methanol. In yet another embodiment, an azeotropic composition may be amixture of about 52 wt. % to about 58 wt % HFMOP and about 42 wt. % toabout 48 wt. % trans-1,2-DCE. The azeotropic compositions may exhibit asubstantially constant boiling point of about 38° C. to about 49° C. atatmospheric pressure.

Other aspects, objectives and advantages will become more apparent fromthe following detailed description when taken in conjunction with theaccompanying drawings.

DETAILED DESCRIPTION

While the present disclosure is susceptible of embodiment in variousforms, there will hereinafter be described presently preferredembodiments with the understanding that the present disclosure is to beconsidered an exemplification and is not intended to limit thedisclosure to the specific embodiments illustrated.

An azeotropic composition containing1,1,1,3,3,3,-hexafluoro-2-methoxypropane (“HFMOP”) is provided accordingto various embodiments. The azeotropic composition may be formulated asa nonflammable composition that can effectively dissolve and remove fluxresidues from soldered components and can be used for various precisioncleaning applications.

An azeotropic composition as used in the present disclosure means anazeotrope mixture or a mixture of two or more materials having anazeotrope-like characteristic of a constant or nearly constant boilingpoint that behaves like a single substance in that the mixtureevaporates/distills without substantial compositional change. Theazeotropic composition substantially does not fractionate uponevaporation, such that the vapor composition and the initial liquidazeotropic composition are substantially identical without anysubstantial compositional differences. A compositional amount of eachcomponent of an azeotropic composition and boiling point of theazeotropic composition may vary with pressure. Compositional details ofthe azeotropic compositions according to various embodiments of thepresent disclosure are provided at an atmospheric pressure.

The azeotropic composition may contain about 52 weight % (wt. %) toabout 99 wt. % HFMOP and about 1 wt. % to about 48 wt. % of a secondcomponent selected from the group consisting of isopropyl alcohol(“IPA”), ethanol, methanol, and trans-1,2-dichloroethylene(“trans-1,2-DCE”.)

In an embodiment, an azeotropic composition may contain about 94 wt. %to about 99 wt. % HFMOP having a boiling point of about 50.0° C. andabout 1 wt. % to about 6 wt. % IPA having a boiling point of about 82.6°C. A 200 g sample of an azeotropic composition containing about 97 wt. %HFMOP and about 3 wt. % IPA was prepared and tested for distillation.The sample exhibited a substantially constant boiling point of about 49°C. at atmospheric pressure. Every 10 ml distillate was collected andanalyzed using gas chromatography (GC). Results are summarized in Table1.

TABLE 1 Distillation of Azeotropic Composition (containing about 97 wt.% HFMOP and about 3 wt. % IPA) Distillate HFMOP (wt. %) IPA (wt. %) 194.65 5.34 2 95.19 4.81 3 94.83 5.17 4 94.81 5.19 5 94.89 5.11 6 94.795.21 7 94.83 5.17 8 94.81 5.19 9 94.69 5.31 10 94.81 5.19 11 94.55 5.4512 94.69 5.31 HEEL 94.32 5.68

In another embodiment, an azeotropic composition may contain about 94wt. % to about 99 wt % HFMOP having a boiling point of about 50.0° C.and about 1 wt. % to about 6 wt. % ethanol having a boiling point ofabout 78.4° C. A 200 g sample of an azeotropic composition containingabout 96.6 wt. % HFMOP and about 3.4 wt. % ethanol was prepared andtested for distillation. The sample exhibited a substantially constantboiling point of about 47° C. at atmospheric pressure. Every 10 mldistillate was collected and analyzed using gas chromatography (GC).Results are summarized in Table 2.

TABLE 2 Distillation of Azeotropic Composition (containing about 96.6wt. % HFMOP and about 3.4 wt. % ethanol) Distillate HFMOP (wt. %)Ethanol (wt. %) 1 93.4 6.6 2 92.19 7.8 3 92.34 7.66 4 92.32 7.68 5 92.137.87 6 92.15 7.85 7 92.17 7.83 8 92.13 7.87 9 92.4 7.6 10 92.17 7.83 1192.25 7.75 12 92.51 7.49 HEEL 92.97 7.03

In another embodiment, an azeotropic composition may contain about 91wt. % to about 97 wt % HFMOP having a boiling point of about 50.0° C.and about 3 wt. % to about 9 wt. % methanol having a boiling point ofabout 64.7° C. A 200 g sample of an azeotropic composition containingabout 94.1 wt. % HFMOP and about 5.9 wt. % methanol was prepared andtested for distillation. The sample exhibited a substantially constantboiling point of about 43° C. at atmospheric pressure. Every 10 mldistillate was collected and analyzed using gas chromatography (GC).Results are summarized in Table 3.

TABLE 3 Distillation of Azeotropic Composition (containing about 94.1wt. % HFMOP and about 5.9 wt. % methanol) Distillate HFMOP (wt. %)Methanol (wt. %) 1 87.35 12.65 2 87.14 12.86 3 87.24 12.76 4 86.79 13.215 86.49 13.51 6 87.2 12.8 7 86.85 13.15 8 87.34 12.66 9 87.1 12.9 1086.25 13.75 11 86.8 13.2 12 86.99 13.01 HEEL 89.06 10.94

In yet another embodiment, an azeotropic composition may contain about52 wt. % to about 58 wt % HFMOP having a boiling point of about 50.0° C.and about 42 wt. % to about 48 wt. % trans-1,2-DCE having a boilingpoint of about 48.0° C. (please confirm this is correct). A 200 g sampleof an azeotropic composition containing about 55 wt. % HFMOP and about45 wt. % trans-1,2-DCE was prepared and tested for distillation. Thesample exhibited a substantially constant boiling point of about 38° C.at atmospheric pressure. Every 10 ml distillate was collected andanalyzed using gas chromatography (GC). Results are summarized in Table4.

TABLE 4 Distillation of Azeotropic Composition (containing about 55 wt.% HFMOP and about 45 wt. % trans-1,2-DCE) Distillate HFMOP (wt. %)Trans-1,2-DCE (wt. %) 1 42.37 57.62 2 40.73 59.26 3 41.04 58.96 4 41.1858.82 5 41.86 58.13 6 40.34 59.65 7 42.09 57.9 8 41.99 58.01 9 42.1357.87 10 41.75 58.25 11 41.19 58.81 12 39.89 60.11 HEEL 45.8 54.2

All patents referred to herein, are hereby incorporated herein in theirentirety, by reference, whether or not specifically indicated as suchwithin the text of this disclosure.

In the present disclosure, the words “a” or “an” are to be taken toinclude both the singular and the plural. Conversely, any reference toplural items shall, where appropriate, include the singular. Allpercentages (%) shown are percent by weight unless otherwise indicated.

From the foregoing it will be observed that numerous modifications andvariations can be effectuated without departing from the true spirit andscope of the novel concepts of the present disclosure. It is to beunderstood that no limitation with respect to the specific embodimentsillustrated is intended or should be inferred. The disclosure isintended to cover by the appended claims all such modifications as fallwithin the scope of the claims.

What is claimed is:
 1. An azeotropic composition comprising: about 52weight % (wt. %) to about 99 wt. %1,1,1,3,3,3,-hexafluoro-2-methoxypropane (“HFMOP”); and about 1 wt. % toabout 48 wt. % trans-1,2-dichloroethylene (“trans-1,2-DCE”); wherein theazeotropic composition has a substantially constant boiling point at aconstant pressure.
 2. The azeotropic composition of claim 1, wherein theazeotropic composition contains about 52 wt. % to about 58 wt % HFMOPand about 42 wt. % to about 48 wt. % trans-1,2-DCE.
 3. The azeotropiccomposition of claim 2, wherein the azeotropic composition consistsessentially of about 55 wt. % HFMOP and about 45 wt. % trans-1,2-DCE,wherein the azeotropic composition has a substantially constant boilingpoint of about 38° C. at atmospheric pressure.